My rebuilt pump our cub worked great for one pass with disc. Now it will not lift and hyd. Lines are hot to the touch. This is the second one he hs done,and the other is still working. Our was only leaking into engine case and worked fine. Any ideal or do need to buy another pump. Thanks

If not air, the next thing to check is the orifice and orifice screen for a piece of junk that got into the system. Remove the pipe plug from the hydraulic system head, then unscrew the orifice to clean it. There should be old posts with details if needed.

ok men, need help bad. whet to my dads and he had taked pump apart again , no a go thing it was leaking and lift would try but couldnt lift disc.i pick up on disc and it would lift but slow and not by it self.i took orfis out it is clear of trash.so i guess ill get a gasket kit and do it myself. dad has had a stroke five years ago so he may have made a mistake.any ideas or am i going the right way. like i said before it worked great but leaked into crank case.

Another suggestion---maybe install the second pump you said is working correctly on the cub having the lifting issues, then at least you would be able to narrow the problem down to a pump or reservoir problem before doing any rebuilding again.

Jim Becker wrote:When assembling the pump, one part can be installed backwards. This will leave the pump non-working. There have been past discussions of this that you should be able to find using the search function.

the pump on the cub, i sold it last year. i rebuilt the pump again myself and it does the same thing. my also also replaced o ring on the valve that controls the up and down of the lift as it had a slow leak. we replaced it once this year but it still leaked. i read here that some guys would wrap a little copper wire then put o ring on, is this problem????